Hmm, after checking that link, I think militant is right. The ads are popping up because Comcast is detecting suspicious activity on their network coming from something bad installed on your computer.
If you are infected, this is the process I’ve been using lately with about 95% success to remove viruses and rootkits:
Download Rkill - http://www.bleepingcomputer.com/download/rkill/
Download TDSSKiller - http://www.bleepingcomputer.com/download/tdsskiller/
Download MalwareBytes - http://www.malwarebytes.org/products/malwarebytes_free/
Save all those to some location you will remember, like the desktop, then reboot your computer and hit F8 while it restarts, to bring up the boot menu. Select “Safe Mode with Networking”. Once it starts up, install and run the programs you downloaded, first RKill, then TDSSKiller, and finally MalwareBytes. Let them update if they need to, then scan and remove anything they find.
After that, you can restart, and unless you have gotten a very tricky infection, you should be good to go.
Something else I failed to mention is that when I have it, it also takes over my wife’s IPhone and my 13 year old son’s Xbox.
P.S. Back when I adopted two children, I posted a vanity, you commented and my kids were reading the comments and got a big kick out of your screen name. I had been trying to convince them that the “boogieman” was real, (They are too old to believe that) I offered them your screen name as proof.